$ git clone -n https://src.fedoraproject.org/rpms/x3270.git /var/lib/mock/f40-build-762721-122109/root/chroot_tmpdir/scmroot/x3270
Cloning into '/var/lib/mock/f40-build-762721-122109/root/chroot_tmpdir/scmroot/x3270'...
$ git fetch origin e682d539b2c20581a8ad040267f3dce6b337ff2c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/x3270
 * [new ref]         e682d539b2c20581a8ad040267f3dce6b337ff2c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e682d53 - updated to 4.3ga4(#2244223)